HetNet Uplink Interference Suppression With Thresholded Channel Matrices
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Solution Overview
Problem
Conventional interference suppression techniques in heterogeneous cellular networks (HetNets) face increased signal processing complexity as the number of small cells grows, particularly in three-dimensional configurations, leading to communication quality degradation.
Innovation Solution
An interference suppression apparatus that estimates propagation-path responses, creates matrices, calculates inverse matrices, and applies reception weights to suppress interference from terminals in other cells, setting responses below a threshold to zero to reduce signal processing and measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reception-interference canceller is used to suppress interference from all terminals in macro cell and small cells, then interference suppression effect is very large, but signal processing amount increases as number of small cells increases
Solution Approach 1:
The patent extracts and removes propagation-path responses with electric power below a predetermined threshold from the second propagation-path response matrix before calculating the inverse matrix. This extraction of insignificant components reduces the computational complexity while maintaining effective interference suppression, directly resolving the contradiction between suppression effectiveness and processing burden.
Solution Approach 2:
The patent changes the parameter threshold by setting an electric power threshold and removing responses below it. This parameter-based filtering transforms the full-dimension interference suppression problem into a reduced-dimension problem, achieving comparable suppression效果 with significantly reduced signal processing requirements.
2Productivity
If number of small cells is increased to cope with traffic demand, then traffic capacity is improved, but signal processing complexity increases
Solution Approach 1:
By extracting and removing propagation-path responses below the threshold value from the response matrix, the patent reduces the matrix dimension that requires inverse calculation. This allows the system to accommodate more small cells for increased traffic capacity while keeping the signal processing complexity manageable through dimensional reduction.
Solution Approach 2:
The patent applies parameter thresholding to the propagation-path responses, changing the effective parameter space from all small cells to only those above the threshold. This enables scaling of small cell deployment for traffic capacity while maintaining bounded processing complexity through the threshold parameter.
Data Source
AI summary
In a HetNet configuration in which plural small-sized second cells are disposed in a first cell, an amount of signal processing for suppressing interference from other cells with respect to a reception signal on an uplink line of a base station of any one of the cells is reduced. An interference suppression apparatus creates a first propagation-path response matrix including a plurality of first propagation-path responses from terminals of plural second cells to a first base station, creates a second propagation-path response matrix including a plurality of second propagation-path responses from terminals of plural second cells to plural second base stations, calculates plural reception weights based on the first propagation-path response matrix and an inverse matrix of the second propagation-path response matrix, and suppresses interference to an uplink of the first base station, based on a reception signal of the first base station, reception signals of the plural second base stations and the plural reception weights. The interference suppression apparatus sets to zero a second propagation-path response having an electric power of magnitude equal to or less than a predetermined threshold value or less than the threshold value among the plurality of the second propagation-path responses included in the second propagation-path response matrix before calculating the inverse matrix.